Driving-gear elevating machinery, &amp;c.



PATENTED MAR. 21, 1905. G. B. HOLLAND & H. JOHNSTON. DRIVING GEAR FOR BLEVATING MACHINERY, &0.

APPLICATION FILED JULY 25,1904.

QauuEduw-zz JibZZaad fiiz i 'y (ii/baa E an Patented March 21, 1905.

NiTED STATES PATENT OFFICE.

GERALD E. HOLLAND AND HENRY JOHNSTON, OF RANGOON, BURMA,

INDIA, ASSIGNORS TO THE HOLLAND JOHNSTON PATENTS LIM- ITED, OF LONDON, ENGLAND.

DRIVING-GEAR FOR ELEVATlNG MACHINERY, &o.

SPECIFICATION forming part of Letters Patent 0. 785,552, dated March 21, 1905.

Application filed July 25, 1904. Serial No. 218,101.

To (1/7 whom it may concern.-

Be it known that we, GERALD EDWARD Hon- LAND, C. I. E. D. S. 0., commander Royal Indian Marine, and HENRY JOHNSTON, subjects of the King of Great Britain and Ireland, residing at Rangoon, Burma, India, have invented certain new and useful Improvements in Driving-Gear for Elevating Machinery or the Like, of which the following is a specification.

This invention relates to driving-gear for coal-elevators of the kind described in our application for patent filed February 7 1903, Serial No. 142,416, or the like machinery, and has for its object the provision of powerful dust-proof gear suitable for driving elevating or other machinery which requires great power with low speed. I

In the accompanying drawings, Figure 1 is a transverse vertical section through the driving shaft and gear; Fig. 2, a section on line 2 2 of Fig. 1; Fig. 3, an end elevation of the upper end of an elevator, showing the driving-wheel; and Fig. 4, a detail view.

The drum a, which carries the endless chain a of the conveyer, is provided on either side along its inner periphery with circular racks b, which gear with the toothed pendulumwheels 0. These wheels are held in position by the pins (1 and are actuated by eccentrics 0, which are keyed ,on the driving-shaft f. The drum (1 revolves on the disks g, the bosses 71/ of which form bearings for the shaft f and are squared. externally and fitted in square holes in the sides a' of the machine. The disks 9 are also slotted for the reception of blocks (17/, in which the ends of the pins (Z are mounted, the slots thus forming guides in which the pins are free to reciprocate. The drivingwheel 7' is keyed on the driving-shaft and may be connected, through suitable gearing, with an electric or other motor;

The rotation of the eccentrics c communicates a swinging motion to the oscillating pendulum-wheels 0 about their pivot-pins d, by

which the tangent point of the said wheels and the racks Z2 is given a circular traverse around the axis of the shaft, the bearingblocks d at the same time reciprocating in the guide-slots in the non-revoluble disks 9. It 5 will be seen that the movement imparted to the circular racks b by the wheels 0 is not a continuous movement, (although the racks and wheels are in constant engagement,) because, owing to the pins (Z being placed as shown when the upper part of the wheel 0 engages with the rack b a short backward movement is given to the d rum (0, and in consequence of this the buckets of the conveyer very efliciently penetrate and take up the coal or other material dealt with.

It will be noticed that the gear is inclosed in a practically dust-proof chamber formed by the chain-drum and the disks on which the drum revolves, the slots (Z being closed by 5 covers CZ.

Having thus described the nature of this invention and the best means we know of carrying the same into practical effect, we claim- 1. An inclosed driving mechanism involving a driving-shaft, a fixed frame, non-revoluble disks mountedin bearings attached to said frame, a drum revolving on said disks and provided with internal circular racks, toothed pendulum-pinions carried by said disks and adapted to gear with said racks, and eccentrics keyed to said shaft and operating the pinions.

2. In driving mechanism such as herein described, a driving-shaft, a circular rack revoluble about the axis of the said shaft, an eccentric fixed on the said shaft, a toothed pinion operated by said ecccntric to gear with said rack, a pivot-pin supporting the said pinion and mounted to slide in fixed guides, substantially as described. 7

3. Inclosed drivinggearing comprising a driving-shaft, eccentrics keyed thereon, sliding blocks, pins carried thereby, toothed pen dulum-pinions mounted on said pins, nonrev oluble disks mounted in suitable bearings, a 9

drum mounted on non-revoluble disks and i names to this specification in the presence of having internal racks gearing With the said tWo subscribing Witnesses.

toothed pendulum-pinions to give intermittent G. E. HOLLAND. movements of rotation of the drum on the H. JOHNSTON.

5 said non-revoluble disks, substantially as de- Witnesses:

scribed. OLIVER IMRAY,

In testimony whereof We have signed our JOSEPH MILLARD. 

